/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineEditor/Public/MoviePipelinePIEExecutor.h
These are called right beforeUMoviePipeline::Initialize(). They only contain the job because no work has been done yet.
typedef TMulticastDelegate_OneParam< void, [UMoviePipelineExecutorJob](API\Plugins\MovieRenderPipelineCore\UMoviePipelineExecutorJob) * > FOnMoviePipelineIndividualJobStartedNative